// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef STARBOARD_RASPI_SHARED_OPEN_MAX_VIDEO_DECODER_H_
#define STARBOARD_RASPI_SHARED_OPEN_MAX_VIDEO_DECODER_H_

#include <queue>

#include "starboard/log.h"
#include "starboard/media.h"
#include "starboard/mutex.h"
#include "starboard/queue.h"
#include "starboard/raspi/shared/open_max/dispmanx_resource_pool.h"
#include "starboard/raspi/shared/open_max/open_max_video_decode_component.h"
#include "starboard/shared/internal_only.h"
#include "starboard/shared/starboard/player/closure.h"
#include "starboard/shared/starboard/player/filter/video_decoder_internal.h"
#include "starboard/shared/starboard/player/job_queue.h"
#include "starboard/thread.h"

namespace starboard {
namespace raspi {
namespace shared {
namespace open_max {

class VideoDecoder
    : public starboard::shared::starboard::player::filter::HostedVideoDecoder {
 public:
  typedef starboard::shared::starboard::player::InputBuffer InputBuffer;
  typedef starboard::shared::starboard::player::VideoFrame VideoFrame;
  typedef ::starboard::shared::starboard::player::JobQueue JobQueue;
  typedef ::starboard::shared::starboard::player::Closure Closure;

  VideoDecoder(SbMediaVideoCodec video_codec, JobQueue* job_queue);
  ~VideoDecoder() SB_OVERRIDE;

  void SetHost(Host* host) SB_OVERRIDE;
  void WriteInputBuffer(const InputBuffer& input_buffer) SB_OVERRIDE;
  void WriteEndOfStream() SB_OVERRIDE;
  void Reset() SB_OVERRIDE;

 private:
  struct Event {
    enum Type { kWriteInputBuffer, kWriteEOS, kReset };
    explicit Event(const Type type) : type(type) {
      SB_DCHECK(type != kWriteInputBuffer);
    }
    explicit Event(const InputBuffer& input_buffer)
        : type(kWriteInputBuffer), input_buffer(input_buffer) {}

    Type type;
    InputBuffer input_buffer;
  };

  bool TryToDeliverOneFrame();
  static void* ThreadEntryPoint(void* context);
  void RunLoop();
  scoped_refptr<VideoFrame> CreateFrame(const OMX_BUFFERHEADERTYPE* buffer);

  void Update();

  // These variables will be initialized inside ctor or SetHost() and will not
  // be changed during the life time of this class.
  scoped_refptr<DispmanxResourcePool> resource_pool_;
  Host* host_;
  bool eos_written_;

  SbThread thread_;
  bool request_thread_termination_;
  Queue<Event*> queue_;

  Mutex mutex_;
  std::queue<OMX_BUFFERHEADERTYPE*> filled_buffers_;
  std::queue<OMX_BUFFERHEADERTYPE*> freed_buffers_;

  JobQueue* job_queue_;
  Closure update_closure_;
};

}  // namespace open_max
}  // namespace shared
}  // namespace raspi
}  // namespace starboard

#endif  // STARBOARD_RASPI_SHARED_OPEN_MAX_VIDEO_DECODER_H_